I already have Windows 8.1 on my newly built PC and wanted to dual-boot with openSUSE. I wrote the install image to a USB, but the install kept hanging so I used network install (also written to a bootable USB).

Before install I created a separate 100 GB partition on my 1 TB RAID1 array that has Windows 8. The partition was created using Windows drive manager. I installed openSUSE on this new partition with no problems, allowing it to autosize its own partitions for boot, swap, etc. After install I tried to use the "boot from local disk" option on the install package on the USB, but I was told that the boot failed.

Without the USB connected, this displays when I try to boot:

δRÉNTFS δRÉNTFS

I cannot advance beyond this point and therefore cannot boot Windows or openSUSE.

Is secure boot turned on? I know some distros have issues with it and some modern hardware has it turned on by default. What kind of raid array? Does fedora boot? (Its got a signed bootloader so it'll boot off secure boot-enabled systems)
– Journeyman Geek♦Jul 20 '15 at 4:23

I have tried with Secure Boot on and off. It is an HDD RAID1 array set up using AMD Option ROM and managed in AMD RAID XPert. And no, all distros I have tried have given me those same error messages.
– Renaud ChauretJul 21 '15 at 12:58

I ended up using the original Windows 8.1 install disk to boot up and refresh the OS, and I am now able to boot Windows successfully. However, still no luck with openSUSE. For now I'm just happy that my PC is functional again.